Device used in a thread twisting machine



Feb. 4, 1964 o. J. IVANTO DEVICE USED IN A THREAD 'rwrs'rmc; MACHINE Filed Feb. 26, 1962 INVENTOR OSMO J IVANTO United States Patent O 3,120,093 DEVICE USED IN A THREAD TWISTING MACHINE Osmo Juhani Ivanto, Otakallio 4, C 37, Helsinki, Otaniemi, Finland Filed Feb. 26, 1962, Ser. No. 175,559 Claims priority, application Finland Apr. 14, 1961 7 Claims. (Cl. 5786) This invention relates to a device used in a thread twisting machine, in which a plurality of threads are twisted together. More particularly, the device is effective in the event of a breakage of one of the threads to cut the remaining threads and thereby prevent feeding thereof for further threaded twisting operations.

The twisting of the threads in a machine for which the invention is adaptable may be performed by twining. The invention can be adapted even for a thread curling machine, in which one or several threads are led onto the same bobbin.

Such unexpected breaking of the threads in twisting machines has required a supervision of the machine. When a thread breaks, the machine is stopped and the ends of the threads are joined. However, the breaking of threads in some of these machines frequently goes undetected for long periods of time. In the meantime twisted yarn has been wound on the bobbin in which one of the threads is missing. Such a yarn cannot be used resulting in considerable economical loss.

It is an object of the invention to terminate the thread twisting operation when one of the threads breaks.

In accordance with this object the remaining threads are cut when one or more of the threads breaks.

It is a further object of the invention to automatically cut the threads when one or more thereof breaks thereby avoiding the need for careful supervision of the machine.

The invention is essentially characterized by a slidably supported guide member of ring shape through which are led the threads to be twisted, which threads cooperatively retain the ring in an equilibrium position such that in the event of breakage of one or more threads, the guide member slides to a new position and contacts cutting means which cuts the remaining threads.

Embodiments of the invention are illustrated in the accompanying drawing wherein:

FIGURE 1 shows a first embodiment of the invention in a front elevation view,

FIGURE 2 is a section on line 22 of FIGURE 1,

FIGURE 3 shows a section on line 33 of FIGURE 1,

FIGURE 4 is a section on line 44 of FIGURE 1, and

FIGURE 5 is a front elevation of another embodiment of the invention.

In the drawing the reference numeral 1 refers to the base plate, on the upper part of which is hung two bobbins 2 and 3, from which threads 4 and 5 are respectively drawn. The threads are led through thread brakes 6 and 7 which cause an equal strain on all of the threads. From the brakes the threads are guided through a ring shaped guide member 8, wherefrom the threads are led as twisted yarn and are spooled on a bobbin (not shown) in a twined or untwined form.

The ring 8 is mounted on a guide bar 9 which from each of its ends is secured to the base plate 1. The ring can move freely along this bar. Below the guide bar 9 are two cutting blades 10 and 11 secured to the base plate 1, the said blades being placed on each side of the threads 4 and 5, at which point the threads are running close to another. The cutting blades are situated at the same distance from the base plate 1 as the threads, and the blades are oblique with the moving direction of the threads, as shown in FIGURE 2.

3,120,093 Patented Feb. 4, 1964 When threads 4 and 5 are pulled forward through the ring 8, the latter is brought into the position shown in FIGURES 13. The position of the ring 8 is determined by the angle of incidence of the threads and their tensional strain. In order to keep the ring in its position even with minor tensional changes in the threads, there is formed in the guide bar 9 a small notch at the point 12. In the event that thread 4 breaks, the ring 8 is moved by the tensional action of the thread 5 to the right in FIGURE 1. The thread 5 contacts the blade 11 and is cut.

On the guide bar 9 or on the base plate 1 there can be arranged two limit breakers such that the ring 8 during its movement will act on the breakers. The limit breakers may be connected with a signal arrangement, which when a thread breaks may give for eX-.

ample a sound signal.

The embodiment shown in FIGURE 5, is the same as the embodiment according to FIGURES 1-4, in that therein is shown a base plate 1, a ring-shaped guide member 3, a guide bar 9, cutting blades 10 and 11 and a notch 12 in the guide bar 9. On the base plate 1 are hung three bobbins 13, 14 and 15, from which the threads to be twisted 16, 17 and 18 are drawn. The threads are led through the thread brakes 19, 20 and 21, which assure an equal strain on each of the threads.

When the number of threads to be twisted is an odd number, the threads cannot be led symmetrically through the ring 8. In that case the middlemost thread could not be able to produce the eflect required for shifting the ring 8 laterally. Should this middlemost thread now happen to break, the remaining threads would not be pressed against the cutting blades. Therefore when an odd number of threads are to be twisted the threads have to be led asymmetrically through the ring as, for example, shown in FIGURE 5. On the other hand, if the number of the threads should be even, as the case is in the embodiment shown in FIGURES 1-4, the threads are led symmetrically through the guiding member 8.

The above disclosure is only intended to illustrate the inventive idea of the invention. The different embodiments adaptable in practice may thus vary considerably within the scope and limits of the appended claims. This concerns especially the manner in which the movement of the guiding member is obtained. This movement can be obtained for instance with the ring 8 stationary on the guide bar 9, and with the latter movably supported in a lateral direction.

The cutting blades may also be placed above the guiding member such that each of the threads to be twisted has a separate blade.

What is claimed is:

1. A device used in a machine in which a plurality of threads are twisted together, said device being adapted in the event of a breakage of one of the threads to cut the remaining threads and thereby prevent feeding thereof for further twisting operations, said device comprising a slidably supported guide member, means for feeding the threads through and in contact with the guide member to cooperatively retain the guide member in a position of equilibrium, said guide member sliding to a new position of equilibrium in the event of breakage of at least one of said threads, and cutting means adjacent the guide member for cutting the threads passing therethrough as the guide member is displaced to said new position by virtue of thread breakage, the guide member being a ring, the device further comprising a guide bar on which the ring is slidably supported.

2. A device as claimed in claim 1 wherein said guide bar is horizontally supported.

3. A device as claimed in claim 1 wherein said guide bar is provided with a notch at the position of equilibrium to retain the guide member thereat when minor tension variations take place in the threads.

4. A device as claimed in claim 1 wherein said cutting means includes blades which have cutting edges which are obliquely disposed with respect to the threads.

5. A device as claimed in claim 4 wherein said blades are located below the guide member one to either side thereof.

6, A device as claimed in claim 1 wherein said threads are even in number and are led symmetrically through the guide member.

References Cited in the file of this patent UNITED STATES PATENTS Pierce Sept. 14,

Rinehart et a1. Jan. 10,

FOREIGN PATENTS Great Britain a Jan. 8, 

1. A DEVICE USED IN A MACHINE IN WHICH A PLURALITY OF THREADS ARE TWISTED TOGETHER, SAID DEVICE BEING ADAPTED IN THE EVENT OF A BREAKAGE OF ONE OF THE THREADS TO CUT THE REMAINING THREADS AND THEREBY PREVENT FEEDING THEREOF FOR FURTHER TWISTING OPERATIONS, SAID DEVICE COMPRISING A SLIDABLY SUPPORTED GUIDE MEMBER, MEANS FOR FEEDING THE THREADS THROUGH AND IN CONTACT WITH THE GUIDE MEMBER TO COOPERATIVELY RETAIN THE GUIDE MEMBER IN A POSITION OF EQUILIBRIUM, SAID GUIDE MEMBER SLIDING TO A NEW POSITION OF EQUILIBRIUM IN THE EVENT OF BREAKAGE OF AT LEAST ONE OF SAID THREADS, AND CUTTING MEANS ADJACENT THE GUIDE MEMBER FOR CUTTING THE THREADS PASSING THERETHROUGH AS THE GUIDE MEMBER IS DISPLACED TO SAID NEW POSITION BY VIRTUE OF THREAD BREAKAGE, THE GUIDE MEMBER BEING A RING, THE DEVICE FURTHER COMPRISING A GUIDE BAR ON WHICH THE RING IS SLIDABLY SUPPORTED. 